Charles doesn't know that his tiredness or stress project without his knowledge, as he thinks he'd grown out of that years ago, well before Raven. The idea would alarm him a little, because being who he is he'd see something like that as inflicting his private pains on others without permission, and that would be wrong. Since he doesn't know he can't feel guilty now, and that's better for everyone.
"It's the middle of the day," Charles says, with a tiny ripple of laughter, and he kisses Erik's bare chest with the tip of his tongue between his lips like a cat being petted, which is more or less exactly what he is at the moment. "I want to hold you. At least until you have somewhere to be. I might sleep--if I do you don't have to stay in here."
He finds with the gentleness of Erik's touch he's brought back to the first time Erik cared for him like this, in that lull between heated mutual explorations of the ways they could fit together over and over again, and despite everything else it sends a shiver through the pit of his stomach. He buries his face wholly in Erik's stomach and breathes there, one hand curling around Erik's hips as he does. Again, it's intimate without necessarily needing to do anywhere.